Buggy code:
public class Main implements ConfigurableProblems , ProblemSeverities { PrintWriter out ; boolean systemExitWhenFinished = true ; boolean proceedOnError = false ; int warningMask = ( ( ( ( ( ( ( ( ( ParsingOptionalError ) | ( MethodWithConstructorName ) ) | ( OverriddenPackageDefaultMethod ) ) | ( UsingDeprecatedAPI ) ) | ( MaskedCatchBlock ) ) | ( UnusedLocalVariable ) ) | ( UnusedArgument ) ) | ( TemporaryWarning ) ) | ( OverriddenPackageDefaultMethod ) ) | ( AccessEmulation ) ; int debugMask = ( Lines ) | ( Source ) ; int targetJDK = JDK1_1 ; boolean verbose = false ; boolean produceRefInfo = false ; boolean importProblemIsError = true ; boolean timer = false ; boolean showProgress = false ; public long time = 0 ; long lineCount ; boolean preserveAllLocalVariables = false ; String [ ] filenames ; String [ ] classpaths ; String destinationPath ; String log ; int repetitions ; int globalProblemsCount ; int globalErrorsCount ; int globalWarningsCount ; String versionID = "0.125.1" ; private static final char [ ] CLASS_FILE_EXTENSION = ".class" . toCharArray ( ) ; int exportedClassFilesCounter ; private static boolean JDK1_1 = false ; protected static ResourceBundle bundle ; private static final String bundleName = "org.eclipse.jdt.internal.compiler.batch.Messages" ; protected Main ( PrintWriter writer , boolean systemExitWhenFinished ) { } protected void compile ( String [ ] argv ) { try { configure ( argv ) ; if ( showProgress ) System . out . print ( Main . bind ( "progress.compiling" ) ) ; for ( int i = 0 ; i < ( repetitions ) ; i ++ ) { globalProblemsCount = 0 ; globalErrorsCount = 0 ; globalWarningsCount = 0 ; lineCount = 0 ; if ( ( repetitions ) > 1 ) { out . flush ( ) ; out . println ( Main . bind ( "compile.repetition" , String . valueOf ( ( i + 1 ) ) , String . valueOf ( repetitions ) ) ) ; } long startTime = System . currentTimeMillis ( ) ; performCompilation ( ) ; if ( timer ) { time = ( System . currentTimeMillis ( ) ) - startTime ; if ( ( lineCount ) != 0 ) { out . println ( Main . bind ( "compile.instantTime" , new String [ ] { String . valueOf ( lineCount ) , String . valueOf ( time ) , String . valueOf ( ( ( ( int ) ( ( ( lineCount ) * 10000.0 ) // ( time ) ) ) // 10.0 ) ) } ) ) ; } else { out . println ( Main . bind ( "compile.totalTime" , String . valueOf ( time ) ) ) ; } } if ( ( globalProblemsCount ) > 0 ) { if ( ( globalProblemsCount ) == 1 ) { out . print ( Main . bind ( "compile.oneProblem" ) ) ; } else { out . print ( Main . bind ( "compile.severalProblems" , String . valueOf ( globalProblemsCount ) ) ) ; } <START_BUG> out . println ( "<seq2seq4repair_space>(" ) ; <END_BUG> if ( ( globalErrorsCount ) > 0 ) { if ( ( globalErrorsCount ) == 1 ) { out . print ( Main . bind ( "compile.oneError" ) ) ; } else { out . print ( Main . bind ( "compile.severalErrors" , String . valueOf ( globalErrorsCount ) ) ) ; } } if ( ( globalWarningsCount ) > 0 ) { if ( ( globalErrorsCount ) > 0 ) { out . print ( ",<seq2seq4repair_space>" ) ; } if ( ( globalWarningsCount ) == 1 ) { out . print ( Main . bind ( "compile.oneWarning" ) ) ; } else { out . print ( Main . bind ( "compile.severalWarnings" , String . valueOf ( globalWarningsCount ) ) ) ; } } out . println ( ")" ) ; } if ( ( ( exportedClassFilesCounter ) != 0 ) && ( ( ( this . showProgress ) || ( this . timer ) ) || ( this . verbose ) ) ) { if ( ( exportedClassFilesCounter ) == 1 ) { out . print ( Main . bind ( "compile.oneClassFileGenerated" ) ) ; } else { out . print ( Main . bind ( "compile.severalClassFilesGenerated" , String . valueOf ( exportedClassFilesCounter ) ) ) ; } } } if ( showProgress ) System . out . println ( ) ; if ( systemExitWhenFinished ) { out . flush ( ) ; System . exit ( ( ( globalErrorsCount ) > 0 ? - 1 : 0 ) ) ; } } catch ( InvalidInputException e ) { out . println ( e . getMessage ( ) ) ; out . println ( "------------------------" ) ; printUsage ( ) ; if ( systemExitWhenFinished ) { System . exit ( ( - 1 ) ) ; } } catch ( ThreadDeath e ) { throw e ; } catch ( Throwable e ) { if ( systemExitWhenFinished ) { out . flush ( ) ; System . exit ( ( - 1 ) ) ; } } finally { out . flush ( ) ; } } public static void compile ( String commandLine ) { } public static void compile ( String commandLine , PrintWriter writer ) { } private void configure ( String [ ] argv ) throws InvalidInputException { } protected ICompilerRequestor getBatchRequestor ( ) { } protected CompilationUnit [ ] getCompilationUnits ( ) throws InvalidInputException { } protected IErrorHandlingPolicy getHandlingPolicy ( ) { } protected FileSystem getLibraryAccess ( ) { } protected ConfigurableOption [ ] getOptions ( ) { } protected IProblemFactory getProblemFactory ( ) { } public static void main ( String [ ] argv ) { } protected void outputClassFiles ( CompilationResult unitResult ) { } protected void performCompilation ( ) throws InvalidInputException { } private void printUsage ( ) { } public static void relocalize ( ) { }

Fix:
out . print ( "<seq2seq4repair_space>(" ) ;